Improvement in gear-cutting attachments



I. bearing box.

Nrrnn STATES wrLLrAM .xRUTzsom on DAYTON, onro, AssrGNoR To eno. w.Hoemnvr PATENT OFFICE. l

AND CHARLES E. PEASE, OF SAME PLAGE.

i IMPROVEMENTINA `GiEAR-CUTTING.ATTAQHMENTS.

Specification forming part of Letters Patent No. 166,705, dated August17, 1875; application rlled April 15, 1875.

To all whom it may concern:

Be it known that I, WILLIAM KRUTZsoH, of Dayton, in the county ofMontgomery and State of Ohio,.have invented newand' useful Improvementsin Gear Cutting Attachments for Milling-Machines, of which the followingis a specication VThe object of my invention is to provide an improvedapparatus, to be secured upon the platen of the machine in the usualmanner, and having its parts so arranged with reference to each otherthat much time can be saved in the operation ot' the machine, and theproper adjustment of its parts can always be insured, as will hereafterbe more fully explained.

In the accompanying drawing, Figure l is a front elevation of so much ofthe machine as is necessary to illustrate my invention. Fig. 2 is a sideelevation of the same through the line fr a: of Fig. 1. Fig. 3 is a topview of Fig. l. Fig. 4 represents the worm applied to the worm-wheel.

' The same letters of reference refer to like n parts.

With the standard A are cast the spindlebearing B and a disk, C, atright angles to the bearing, and having a circumferential guide-slot, G,occupying a position about halfway from the center 'to itscircumference. F is a worm-wheel upon the end of the spindle T, actuatedby a worm, M, in the bearing-box, D. An arm, H, iny which thebearing-box is pivoted at k, fits snugly between the disk C and theworm-Wheel, embracing the spindle loosely, so as not to interfere withits action. A set-screw, h, with a washer, passes through the slot inthe disk, and isV embedded in the armH, so that upon tight# ening thescrew the arm can be clamped to the disk. A latch, a, pivoted in the boxD at m, engages with the slot in `the adjustable plate b pivoted uponthe same axis as the This plate is adjustable by J means of twoset-screwsJQQpassing through g bearings b on each side of the axis, andworking against fixed shoulders upon the supporting-arm H, as seen inFig. 3. By this means' the position of the detaining-slot in the plate bcan be changed to throw the worm more of gear.

eectually into gear with the wheel F, or to loosen it, as may bedesired. A set-screw, n, Fig. 4, passing through a bearing in the bottomot' the box D, forms the pivot on which the worm M turns,y and, by meansof this screw, the worm can always be properly adjusted, and any wearcompensated for. Formed with the box D is the worm shank bearing P,supporting anindex plate or disk, e.; A pointer, d, upon the shank, isused, in connection with the scale upon thedisk, for the customarypurpose. The shank is provided with a crank, R, by which the operator isenabledto revolve the spindle, T, and with it the work to be milled,which is chucked in the .usual manner. I

Supposing the blank in which it is desired to cut teeth to be properlyadjusted in myl apparatus upon a milling machine, I would thus describeits operation: The blank is brought under the cutter, and the firstincision made. Now, the scale upon the disk e enables the operator toknow just what part of a revolution, or how many revolutions, it isnecessary to give the worm to bring the vblank into position for thesecond incision,

forming the irst tooth. Vhen the blank is Very small, and but few teethare to be cut,

the arm H is brought into use in the followr ing manner: A bolt, s, inthe slot G, whose head is provided with a pointer that extends upward tothe periphery of the disk C, and

always points radially, can be clamped at any position in the slotindicated by a scale upon the periphery ofthe disk. The latch a is thendisengaged, and the bearing box D turned upon its pivot, throwing theworm out The arm carrying Athe worm and its appointments is then turnedupon its axis until it strikes the head of the bolt s. The worm is thenthrown into gear, and the arm brought to its former position, causingthespindle to revolve to an extent ascertained by means of the index uponthe disk. This opera-tion is repeated as often as may be necessary, and

saves the time that would be lost in employing the crank R to cause thesame result.

Having fully described myinvention, Iclaim as new and desire to secureby Letters Patent` l. In a gear-cutting apparatus, the arm H, arrangedas described, to which is pivoted the Worm and its bearings, incombination with a xed slotted disk, C, and indicatingbolt s,substantially as herein set forth.

2. The adjnstable pivoted plate b, provided D. 1875.

with the set-screw c, in combination with the arm H and latch a, in themanner and for the purpose specified.

3. The combination of the standard A, bearing,` B, disk @spindle T, armH, worm-Wheel F, and wormM, the Whole arranged substantially asdescribed, and for the purpose specied. 1 l

Witness my hand this 2d day of April, A.

WILLIAM KRUTZSCH. Witnesses :k

J. P. WHITMORE,

OHAS. M. PECK.

